Burr wiper



June 11, 1968 R. L. WINKLER BURR WIPER 2 Sheets-Sheet 1 Filed April 22, 1966 Robert 1. Wink/er June 11, 1968 Filed April 22, 1966 R. L. WINKLER 3,387,479

BURR WIPER 2 Sheets-Sheet Z INV ENT OR Robe/'1 L. Wink/er United States Patent 3,387,479 BURR WIPER Robert L. Winkler, Baltimore, Md, assignor to Bethlehem Steel Corporation, a corporation of Delaware Filed Apr. 22, 1966, Ser. No. 544,500 4 Claims. (Cl. 72-177) This invention relates in general to metalworking, and more particularly to the edge treatment of slitted or trimmed sheet or strip.

The preparation of metal sheet or strip for whatever ultimate use normally includes edge trimming or slitting. It is well known that regardless of the sharpness of the slitting apparatus the sheared edges are found to have burred surfaces. Heretofore, the objectionable burred surfaces have been eliminated in one of several ways, e.g. by brushing, filing, melting or flattening These methods all have disadvantages. Brushing or filing the burrs 01f creates a scrap problem; melting is a complicated and expensive process and flattening the burrs through the use of rolls may damage the surface of the sheet or strip It is desirable in the preparation of sheet or strip for coating to remove the burrs from the flat surfaces to prevent a thickened edge due to build-up of coating material adhering to the burrs. The thickened strip edge results in spooling of the coils. Other methods have been attempted to eliminate the edge build-up of coating material to avoid spooling, but they have been successful only in partially reducing the build-up.

It is therefore an object of this invention to provide an inexpensive and efficient means of eliminating burrs from the surfaces of metal strip or the like.

Another object of the invention is to provide improved means for preparing metal strip or the like for the deposition of a coating material thereon.

Other and further objects of the invention will be apparent to those skilled in the art from the following detailed description of the annexed sheets of drawings in which, by way of a preferred example only one embodiment of the invention is illustrated.

The present invention makes available a means for substantially eliminating the burrs projecting normally from the surface of metal strip or the like without any of the aforementioned objections and comprises generally apparatus for wiping the burred edges of metal strip or the like outward from said strip and flattening the burrs to provide a level strip.

Referring to the drawings:

FIGURE 1 is a schematic arrangement of a strip processing line employing apparatus constructed in accordance with the instant invention;

FIGURE 2 is an elevational view of the apparatus;

FIGURE 3 is a sectional view of the apparatus, taken on line 33 of FIGURE 2;

FIGURE 4 is an exaggerated cross-sectional view of a strip edge showing the burr resulting from a slitting or trimming operation;

FIGURE 5 shows the strip edge of FIGURE 4 after the burr has been wiped outward by the apparatus;

FIGURE 6 shows the strip edge of FIGURE 5 after the burr has been flattened; and

FIGURE 7 is a partial plan view of an advancing strip in contact with burr wiper apparatus.

Referring now in detail to the drawings and first to FIGURE 1 the application of the instant invention is clearly seen. A metal strip 1 of the like is fed from a coil 2 into slitting apparatus 3 where the edges are trimmed to establish accurate and uniform width. As the advancing metal strip 1 approaches the burr wiping apparatus 4, the level of the strip is maintained by rolls 5 and 6, slightly offset for reasons which will become apparent. The burr wiping apparatus 4, to be described later in detail, engages 3,387,479 Patented June 11, 1963 the strip 1 and by reason of its unique design wipes the burrs outward from the edge thereof. Following the burr wiper 4 the strip is subjected to light burr masher action between the cooperating upper roll 8 and lower roll 9 of the conventional burr masher 10 where the burrs are pressed level with the sheet. The strip 1 with its edges treated in the manner thus described is rewound on a conventional recoiler 11.

The burr wiper apparatus 4, shown in more complete detail in FIGURES 2 and 3 comprises a pair of offset rolls 5 and 6 and conical rollers 7. The burr wiper apparatus 4 is mounted on any suitable frame 13 by face plates 12 bolted or otherwise suitably fastened to the frame 13 at each outside face 14 thereof. Rolls 5 and 6 pass the advancing strip 1 between them to maintain the level of the pass line and are offset to accommodate various gages of strip without having to change the relative position of said rolls. The offset relation of rolls 5 and 6 is also required to prevent pinching the burred edges of the slitted strip 1 with the possible effect of bending the burrs under the sheet making subsequent wiping difficult. Conical rollers 7 comprise a surface disc 15 made from a heat treated steel hardened to approximately 50 R for toughness and wearability, removably fixed as by bolting to a spindle face plate 16. The spindle shaft 17, integral with said face plate 16, is rotatably mounted in housing 18 with its axis inclined with respect to the advancing strip 1. The angle of inclination of the axis of shaft 17 with respect to the lateral dimension of the strip is substantially The angle of inclination 6 with respect to the longitudinal dimension of the strip is less than 90 inclined toward the feed end of the strip. The angle of inclination 5 may be varied but it has been found convenient to use an angle of approximately 15 from vertical. The slope of the conical surface is about 15 also and therefore, as is readily seen, the uppermost element of the conical surface is substantially horizontal and thus parallel to the strip surface. The conical rollers 7 with their bearings, spindles, and housings are mounted on slides 19 which maintain the proper angular relationships and further permit adjustments for various widths of strip by means of a common screw 20 and handwheel 21. Slides 19 are in sliding engagement with shafts 25. The common screw 20 is journaled in face plates 12 and is provided with a threaded portion adjacent either end for adjustment by handwheeel 21, the threads being right hand and left hand respectively on opposite ends.

It is readily seen-from FIGURE 7 that the edge of an advancing metal strip 1, while under normal tension, passing over the surface of a conical roller 7 will contact the surface of disc 15 at a point on said surface within the quadrant 24 defined by a line from the cen terpoint of disc 15 extending parallel to and in the direction of travel of strip 1, and a line through the centerpoint of said disc 15 substantially perpendicular to and transverse of said strip 1. Friction between the advancing strip 1 and the surface of said disc 15 will cause the conical roller 7 to rotate. By virtue of this rotation and the previously defined area of contact, the relative motion of the strip, the longitudinal component and the angular rotation of the disc surface results in a lateral component which wipes the burrs outward. Light burr masher action by rolls 8 and 9 of the conventional burr masher 10 will then bend the burrs level with the strip.

The effectiveness of the instant invention is seen in the sequence of FIGURES 4, 5 and 6 which are exaggerated cross-sectional views of a strip edge. FIGURE 4 shows the effect of the burr producing slitting operation and FIGURE 5 shows the burred edge of FIGURE 4 after action of the burr wiper apparatus, the burrs being wiped outward from the strip edge. FIGURE 6 shows the strip edge of FIGURE 5 with the burrs bent level with the strip by the action of conventional burr masher rolls 8 and 9 to complete the edge preparation of strip 1 for the application of a coating material 22 shown in dotted lines. It is seen that the coating 22 on the strip is level and any build-up will occur on the ends 23 Where it is inconsequential.

It should be understood that while the details described refer to a particular embodiment there are many modifications and substitutes that will serve equally well Without detracting from the scope and spirit of the invention. The disc 15, for example, shown in the preferred embodiment as having a conical surface may be arcuate or flat as Well.

From the foregoing it will be seen that the method and apparatus thus described provides an efiicient means for wiping the burrs from a surface of a metal strip or the like Without having to completely remove said burrs. The major contribution to edge build-up of coating material is thus eliminated and the problem of spooling is substantially overcome. Also, the removal of the burrs prevents subsequent scratching of the surface of the strip.

I claim:

1. A burr wiping apparatus for the treatment of the burred edges of an advancing metal strip comprising:

a disc mounted for rotation about its axis, the surface of said disc mounted to contact the burred edge of said strip on said surface Within the quadrant defined by a line from the centerpoint of said disc parallel to and in the direction of travel of said strip, and a line through said centerpoint substantially perpendicular to and transverse of said strip. 2. The apparatus as described in claim 1 in which said surface is conical.

3. The apparatus as described in claim 1 in which said surface is arcuate.

4. A method of treating advancing metal strip under tension comprising:

(a) trimming the edge of said strip, (b) Wiping the burrs produced by said trimming outward from said edges, and (c) bending said burrs level With said strip.

References Cited UNITED STATES PATENTS 231,146 8/1880 Briggs 72167 2,335,334 11/1943 Yoder 72-129 2,409,631 10/ 1946 Jones 27184 RICHARD J. HERBST, Primary Examiner.

L. A. LARSON, Assistant Examiner. 

1. A BURR WIPING APPARATUS FOR THE TREATMENT OF THE BURRED EDGES OF AN ADVANCING METAL STRIP COMPRISING: A DISC MOUNTED FOR ROTATION ABOUT ITS AXIS, THE SURFACE OF SAID DISC MOUNTED TO CONTACT THE BURRED EDGE OF SAID STRIP ON SAID SURFACE WITHIN THE QUADRANT DEFINED BY A LINE FROM THE CENTERPOINT OF SAID DISC PARALLEL TO AND IN THE DIRECTION OF TRAVEL OF SAID STRIP, AND A LINE THROUGH SAID CENTERPOINT SUBSTANTIALLY PERPENDICULAR TO AND TRANSVERSE OF SAID STRIP. 